Cementitious compound.



, PATEN IttltVfi) J.- MORRIS, OF SEATTLE, .WASHINGTON, ASSIGNOR OFONE-HALF TO JAMES E.

CARROLL, F SEATTLE, WASHINGTON.

GEMENTITIOUS COMPOUND.

i= lldltllil, it may concern:

it knownthat I, IDAVID J. MORRIS, a

ten of the United States, and 'resident t the ity oli Seattle, in thecounty of King and ruate of Washington, have invented c all: new anduseful Improvements in t l:ioi.is Compounds, of which the folk is aspecification.

My invention relates to a ccmentitious 1e compound which is adapted tobe used as a case, or cemcntitious agent with which to hind togethervarious kinds of aggregates and materials to form solid masses and forl'ormi up; nu merous articles.

153 The ol'iject of my invention is the produciion oi" a eo-m 'ioundwhich is of a novel charactor and which may be used to cement to-.?t)l'i'il!l' other materials in a more perfect warmer than is possibleby the-use of the 'rnnon types of cement, and to use matewhich are notnow so used for the purof forming a cemenlitious compound.

. ly invention consists oil. a compound noin tmscd ot' the ingredientscombined in M3 the proportions and treated in the manner which will heherein described and particur detin l by the claims.

y invention is based primarily and pally upon certain facts which I haverelating to the behavior of a uni ot magnesia when combined with ,inpri'al'icnts, in,so far as its cementi- 5. action is concerned and. thecharacter "vior oi" the resulting compound a r mi, mg.

'lfhc ingredients which I include in makina' my compound are oxid ofmagnesia,

. cium hydrate and a. solution of chlorid of ma gnesia. The oxid ofmagnesia and the calcium hydrate should be in the form of a dry powder.The chlorid of magnesia should he a solution at the specific gravity of"t Baum.

, not suilicient, that the oxid of magnesia. be ordinary commercialcalcined inaprnesia, as this invariably contains such impi 'fzics,particularly in the way of a percentage of lime. or calcium oxid. whichwill interfere ith the proper chemical aclion and prevent obtaining thesuperior results which would follow from the use of a pine lucid oimagnesia. A slight amount in" rnh-iuni oxid in the magnesium oxid, willcum-1o serious trouble or failure. \Vhile it is Specification of LettersPatent.

Application filed March 20, 1913.

Pat outed May 12, mil;

Serial No. 755,810.

the calcium contained .in the magnesium used, this would, practically,be impracticable. When properly made the result is a fixed chemicalcompound, and one in which an excess of calcium has a very deleteriouseflect. i

The proportions of the ingredients used are as follows. 'lhrco parts oi.pure oxid of magnesia are combined with one part of calcium hydrate,both heing in the dry form. After these have been thoroughly mixed, asuilicient quantity of the 21 Baunu'i solution of chlorid of imigncsiais added, to give the plastic quality desired. The amount of thissolution used will depend upon the conditions under which it is to beused and the results desired. In some cases a rather still paste may bebest suited for the purpose, while in other cases a thin, runny mixturemay be best.

The above ingredients, mixed in the proportions given, form a compoundwhich may be used as a ccmentitious base or binder for various kinds ofaggregates, after the manner in which cement is used to bind togetherother materials. The relative proportions of aggregates and binder willvary with the character oi the aggregates and the such an extent that itthey be safely handled,

but for thorough curing or setting, it requires approximately ten days.During this time the temperature of the product, to secure the mostperfect results, should be maintained continuously at 70 F. I have foundthat during this period of time and under the conditions of temperaturenamed, the product eflloresces, bringing to the surface a coatingof'chlorin salts, supposed to be chlorid of calcium, which may be wipedoff. If the temperature conditions are changed, this etllorescence stopsand these chlorids are permanently retained in the hody of the product,making the product much interior for some purposes. Where cured underthe preferred conditions the product has a bright appearance, will takea high polish, and. is superior in strength and its ability to resistthe action of heat, water, acids and other deterioratingagentlmctil'tltlCtllly possible to offset the effect of l cies. If thiscuring action is checked by change of temperature or other influences,

[ the product is yet a good, strong product,

but its surface appearance is not so bright and it will not take as finea polish. It is also somewhat inferior in the practical qualities ofstrength and ability to resist heat and other deteriorating influences.

' gregates used. '1

The uality of a stone made by combinare themselves resistant to theinfluences of I heat, moisture, etc. the result is a stone withremarkable fire and water resisting qualities. As commerciallyfurnished, the product will consist of the oxid oi magnesia and thecalcium hydrate, combined together in a dry, powdered mass, and thechlorid of magnesia, separate'therefrom, this last may be mg mineralmasses bythe use of my binder,

ocaeea in the dry form, or as a solution of a known strength, as foundto best fit the conditions under which it is to be handled and sold.These two products will be combined, under the conditions hereinbeliorestated, When the product is to be used.

What I-claim as my invesnionv is:

1. A ,cement-itious compound composed of calcium-free oxid of magnesiathree parts and calcium hydrate one part.

2. A cementitious binder composed of oxid ofmagncsia and calcium hydratein the proportions of three parts of the mild of magnesia and one'partof the calcium hydrate.

In testimony whereof I have hereunto aflixed my signature at Seattle,Washington this 13th day of March, 1913. I

DAVID J. ltiORltlS.

Witnesses:

P. J. CLARKE, F. 0. Kansans.

